Water-based polyurethane dispersions and their preparation
US11976211B2 · kind B2 · utility
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10Claims
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Key dates
| Filing date | Nov 19, 2019 |
| Grant date | May 7, 2024 |
| Priority date | — |
| Expiry date | Oct 2, 2040 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G18/758
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A prepolymer comprising an acid group is made by a process comprising the step of contacting: (i) a di-isocyanate, (ii) a polyol containing an acid group, and (iii) a polyol without an acid group, the contacting conducted under reaction conditions and in a solvent consisting essentially of: (A) a first component consisting essentially of at least one glycol ether ketone, and (B) optionally, a second component consisting of at least one aprotic glycol ether. The prepolymer is useful in the preparation of water-based polyurethane dispersions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.